CN114066165A - Improved power transmission line high-order landslide risk evaluation system and method - Google Patents
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Abstract
The invention discloses an improved power transmission line high-order landslide hazard evaluation system and method. According to the method, landslide stability and iron tower exposure are used as the risk evaluation indexes of the high-order landslide of the power transmission line, the stable state of the landslide is considered, the spatial position relation of the landslide and the iron tower is also considered, and the technical effect that the evaluation result is more targeted to guiding the prevention and control of the geological disaster of the power transmission line and the result is more accurate is achieved.
Description
Technical Field
The invention relates to the technical field of power transmission line landslide hazard risk evaluation, in particular to an improved power transmission line high-order landslide hazard risk evaluation method.
Background
With the gradual improvement of national requirements on smart power grids and green power grids, the construction requirements of power transmission lines with high voltage levels and longer transmission distances are increased day by day, more and more power transmission lines need to pass through mountainous areas where geological disasters are prone to happen, and the threat of the power transmission lines in the mountainous areas to the geological disasters is also highlighted day by day.
At present, the landslide risk evaluation of the power transmission line is mainly carried out by referring to the specified requirements of geological disaster risk assessment technical requirements (trial), selecting factors such as terrain, geology and human activities which affect landslide stability through field investigation of landslide bodies, and carrying out evaluation through a qualitative or quantitative evaluation method. However, the power transmission line is a special linear project with discontinuously distributed ground surfaces, the power transmission line has the project characteristic of traversability to landslide, and if the power transmission line is evaluated according to a conventional fixed building without considering the position relation between a power transmission iron tower and the landslide, the obtained landslide risk level is not accurate.
In summary, in the process of implementing the technical solution of the present invention, the inventor of the present application finds that at least the following technical problems exist in the prior art: the landslide hazard risk evaluation factor of the power transmission line has weak pertinence, the position relation between an iron tower and a landslide is not considered, the risk level is not accurate, and the like.
Disclosure of Invention
The invention aims to provide an improved system and method for evaluating the risk of high-order landslide of a power transmission line, which are used for evaluating the risk of high-order landslide of the power transmission line on the basis of integration of stability of the high-order landslide of the power transmission line and exposure of an iron tower, solve the technical problems of low efficiency and accuracy of the conventional method for evaluating the risk of high-order landslide of the power transmission line in a mountainous area, and realize the technical effects of efficiently judging the risk of high-order landslide of the power transmission line in the mountainous area and accurate judgment result.
In order to achieve the purpose, the improved power transmission line high-order landslide risk evaluation system comprises an evaluation factor establishing module, an evaluation factor grading module, an evaluation factor weight determining module, an evaluation standard quantifying module, an evaluation index grading module, an exposure grading module and a landslide risk judging module, wherein the evaluation factor establishing module is used for establishing a power transmission line high-order landslide risk evaluation system;
the evaluation factor establishing module is used for establishing a stability evaluation factor of the high-order landslide of the power transmission line in the mountainous area according to the characteristics of the high-order landslide of the power transmission line in the mountainous area, and the evaluation factor comprises a primary evaluation factor and a secondary evaluation factor; the evaluation factor scoring module is used for grading and scoring the secondary evaluation factors established by the evaluation factor establishing module to obtain a quantitative value of the evaluation index of the secondary evaluation factors; the evaluation factor weight determining module is used for determining the weight of the secondary evaluation factor established by the evaluation factor establishing module to obtain the weight of the secondary evaluation factor; the evaluation standard quantifying module performs combined operation on the secondary evaluation factor evaluation index quantification value obtained by the evaluation factor scoring module and the secondary evaluation factor weight obtained by the evaluation factor weight determining module to obtain a landslide stability evaluation index; the evaluation index grading module is used for grading the landslide stability evaluation index established by the evaluation standard quantifying module to obtain a landslide stability grade; the exposure grading module grades the exposure of the iron tower to obtain the exposure grade of the iron tower; the landslide hazard judgment module integrates the landslide stability grade obtained by the evaluation index grading module and the iron tower exposure grade obtained by the exposure grading module to obtain a high-order landslide hazard judgment standard of the power transmission line, so that the high-order landslide hazard grade of the power transmission line is obtained.
An improved method for evaluating the risk of high-order landslide of a power transmission line comprises the following steps:
and 7, integrating the landslide stability grade obtained in the step 5 and the iron tower exposure grade obtained in the step 6 to obtain a high-order landslide risk judgment standard of the power transmission line, so as to obtain the high-order landslide risk grade of the power transmission line.
The invention has the beneficial effects that: the method adopts a multi-objective decision-making analytic hierarchy process technical means, solves the technical problems of low efficiency and accuracy of the existing mountain area power transmission line high-order landslide stability judgment method, and achieves the technical effects of efficiently judging the mountain area power transmission line high-order landslide stability and accurate judgment result. The landslide stability and the iron tower exposure degree are jointly used as the evaluation indexes of the risk of the high-order landslide of the power transmission line, and the stable state of the landslide and the space between the landslide and the iron tower are considered.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
FIG. 2 is a flow chart of the method of the present invention;
FIG. 3 is a diagram showing a landslide stability evaluation factor;
FIG. 4 is a model diagram of a hierarchical structure of landslide stability evaluation factors;
FIG. 5 is a schematic diagram of tower exposure;
the system comprises a 1-evaluation factor establishing module, a 2-evaluation factor grading module, a 3-evaluation factor weight determining module, a 4-evaluation standard quantifying module, a 5-evaluation index grading module, a 6-exposure grading module and a 7-landslide risk judging module.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
an improved power transmission line high-order landslide risk evaluation system is shown in figure 1 and comprises an evaluation factor establishing module 1, an evaluation factor scoring module 2, an evaluation factor weight determining module 3, an evaluation standard quantifying module 4, an evaluation index grading module 5, an exposure grading module 6 and a landslide risk judging module 7; the evaluation factor establishing module 1 is used for establishing a stability evaluation factor of the high-order landslide of the power transmission line in the mountainous area according to the characteristics of the high-order landslide of the power transmission line in the mountainous area, wherein the evaluation factor comprises a primary evaluation factor and a secondary evaluation factor; the evaluation factor scoring module 2 is used for grading and scoring the secondary evaluation factors established by the evaluation factor establishing module 1 to obtain a quantitative value of the evaluation index of the secondary evaluation factors; the evaluation factor weight determining module 3 is configured to determine the weight of the secondary evaluation factor established by the evaluation factor establishing module 1, and obtain the weight of the secondary evaluation factor; the evaluation standard quantifying module 4 performs combined operation on the secondary evaluation factor evaluation index quantification value obtained by the evaluation factor scoring module 2 and the secondary evaluation factor weight obtained by the evaluation factor weight determining module 3 to obtain a landslide stability evaluation index, and the landslide stability evaluation index is used as a quantitative evaluation standard of the landslide stability degree; the evaluation index grading module 5 is used for grading the landslide stability evaluation index established by the evaluation standard quantifying module 4 to obtain a landslide stability grade; the exposure grading module 6 grades the exposure of the iron tower to obtain the exposure grade of the iron tower; the landslide risk judgment module 7 integrates the landslide stability grade obtained by the evaluation index grading module 5 and the iron tower exposure grade obtained by the exposure grading module 6 to obtain a high-order landslide risk judgment standard of the power transmission line, so that the high-order landslide risk grade of the power transmission line is obtained.
In the above technical solution, the method for establishing the evaluation factor of the stability of the high-order landslide of the power transmission line in the mountain area by the evaluation factor establishing module 1 is as follows: firstly, determining a primary evaluation factor and an undetermined secondary evaluation factor representing the primary evaluation factor according to the characteristics of the high landslide of the power transmission line in the mountainous area; and secondly, selecting a secondary evaluation factor according to the data acquirability of the undetermined secondary evaluation factor.
In the above technical solution, the first-level evaluation factor in the evaluation factor establishing module 1 includes instability evidence, slope morphology, structural features and human engineering activities, and the second-level evaluation factor includes at least one of the following: surface fractures; a rate of deformation; a slope; the slope height; a structural surface slope body; a slope body structure; excavating; and (5) preventing and treating measures.
Surface fracture: cracks on the slope surface are the most effective evidence for proving instability, old cracks and new cracks, and the instability can be proved when the cracks gradually become larger and have partial sliding and the like; deformation rate: acquiring the annual average deformation rate of a target area by utilizing an InSAR technology, and taking the annual average deformation rate as an important index of the current activity of the landslide; gradient: the field investigation results of a large number of natural slopes and artificial slopes prove that steep terrains are necessary conditions for collapse and slide, and the slope is unstable when the slope is larger for an empty surface; slope height: the slope height has obvious influence on the landslide, the landslide is easy to occur when the height is larger, and the corresponding scale and strength are larger; structural surface slope body: structural surface development is an important factor affecting landslide; the slope body structure: the layered slope structure can be divided into 4 types of forward slope, steep slope, reverse direction and near horizontal rock strata according to the dip angle of the rock strata (or other structural surfaces) and the relation with the slope surface; excavating and moving: the degree of damage of human excavation activities to a slope body is large, such as coal mining, highway slope cutting and the like; and (4) control measures: for the discovered potential landslide, effective protection measures are carried out on the landslide, such as anchor bolt support, retaining walls and the like.
In the above technical solution, the relationship between the primary evaluation factor and the secondary evaluation factor is shown in fig. 3: the earth surface crack and the deformation rate in the secondary evaluation factor belong to instability evidence in the primary evaluation factor, the slope and the slope height in the secondary evaluation factor belong to slope form in the primary evaluation factor, the structural surface slope body and the slope body structure in the secondary evaluation factor belong to structural characteristics in the primary evaluation factor, and the excavation activity and the prevention and treatment measure in the secondary evaluation factor belong to human engineering activity in the primary evaluation factor.
In the above technical solution, the specific implementation manner of grading and scoring in the evaluation factor scoring module 2 is as follows: according to the geological expert experience, the secondary evaluation factors are divided into a grade 1, a grade 2, a grade 3 and a grade 3, the score of the grade 1 is 10, the score of the grade 2 is 7, the score of the grade 3 is 4, the score of the grade 4 is 1, and the quantitative value of the evaluation factors is shown in the table 1.
TABLE 1 quantitative evaluation of evaluation factors
In the above technical solution, the specific implementation steps of the evaluation factor weight determining module 3 obtaining the secondary evaluation factor weight include constructing a hierarchical structure diagram, constructing a judgment matrix, and calculating the evaluation factor weight;
the hierarchical structure diagram comprises a decision target layer, a criterion element layer and an alternative scheme layer, wherein the decision target of the decision target layer is landslide stability, and the criterion element in the criterion element layer comprises at least one of the following components: surface fractures; a rate of deformation; a slope; the slope height; a structural surface slope body; a slope body structure; excavating; a control measure, alternatives in the alternative layer including stable and unstable.
The specific implementation method for constructing the judgment matrix comprises the following steps: alphabetically representing the secondary evaluation factor as x1,x2...,xnWherein n is the number of the secondary evaluation factors, judging the expression of the matrixComprises the following steps:
in the judgment matrix, selecting the second-level evaluation factor of the first column of the matrix as the evaluation factor to be compared, selecting the second-level evaluation factor of the first row of the matrix as the reference evaluation factor, and x11Represents the evaluation factor x to be compared1And a reference evaluation factor x1Is compared to the score, x12Represents the evaluation factor x to be compared1And a reference evaluation factor x2Is compared to the score, x1nRepresents the evaluation factor x to be compared1And a reference evaluation factor xnIs compared to the score, x21Represents the evaluation factor x to be compared2And a reference evaluation factor x1Is compared to the score, x22Represents the evaluation factor x to be compared2And a reference evaluation factor x2Is compared to the score, x2nRepresents the evaluation factor x to be compared2And a reference evaluation factor xnIs compared to the score, xn1Represents the evaluation factor x to be comparednAnd a reference evaluation factor x1Is compared to the score, xn2Represents the evaluation factor x to be comparednAnd a reference evaluation factor x2Is compared to the score, xnnRepresents the evaluation factor x to be comparednAnd a reference evaluation factor xnAn importance comparison score of; the importance comparison score has a score range of 1-9.
The importance comparison score of 1 represents that the evaluation factor to be compared is equally important as the reference evaluation factor; the importance comparison score of 3 indicates that the evaluation factor to be compared and the reference evaluation factor are slightly important; the importance comparison score of 5 indicates that the evaluation factor to be compared and the reference evaluation factor are more important; the importance comparison score of 7 indicates that the evaluation factor to be compared and the reference evaluation factor are strongly important; the importance comparison score of 9 indicates that the evaluation factor to be compared is extremely important to the reference evaluation factor.
The scoring method for the comparison condition comprises the following steps: the evaluation factor weight calculation is to introduce the judgment matrix into the analytic hierarchy process professional software (yaahp) and calculate the weight of the evaluation factor, and the weight of each evaluation factor is shown in table 2.
TABLE 2 evaluation factor weights
In the above technical solution, the combined operation formula of the landslide stability evaluation index S in the evaluation criterion quantifying module 4 is:
S＝V1W1+V2W2+V3W3+V4W4+V5W5+V6W6+V7W7+V8W8
in the formula: s is a landslide stability index, and the larger the value is, the more unstable the tower footing is; v1The quantitative value of an evaluation index of the slope crack, V2For evaluating the quantitative value of the index, V, of the deformation rate3For the grade evaluation index quantification, V4Evaluation of the quantitative value of the index, V, for the slope height5For the evaluation of the index quantification, V, of the structural plane6For evaluating the quantitative value of the index, V, of the slope structure7Evaluation of quantitative values of indexes for excavation activities, V8Evaluating the index quantization value for the prevention measure; w1Evaluation of the index weight value for slope cracks, W2For the deformation rate evaluation index weight value, W3For gradient evaluation of the weight value of the index, W4The weight value of the slope height evaluation index, W5For structural surface evaluation of the weight index, W6Evaluating the weight value of the index for the slope structure, W7For evaluating the weight value of the index for excavation activities, W8And evaluating the index weight value for the prevention and treatment measures.
In the technical scheme, the grade of the landslide stability obtained by the evaluation index grading module 5 comprises poor landslide stability, poor landslide stability and good landslide stability, and the landslide stability evaluation index S corresponding to the poor landslide stability is 5.6-10; the landslide stability evaluation index S corresponding to poor landslide stability is more than or equal to 3.1 and less than 5.6; and the landslide stability evaluation index S corresponding to good landslide stability is more than or equal to 0 and less than 3.1.
In the above technical scheme, the evaluation index of the exposure of the iron tower obtained by the exposure grading module 6 is an included angle α between the iron tower and the highest point of the top of the landslide, and the grading index of the exposure of the iron tower obtained by the exposure grading module is an included angle α between the lowest point of the front edge of the landslide and the highest point of the top of the landslide1And angle of arrival of landslide α2；
The included angle alpha between the iron tower and the highest point of the top of the landslide is atan (H/L)
In the formula, H is the height difference between an iron tower and the highest point of the top of the landslide, L is the horizontal distance between the iron tower and the highest point of the top of the landslide, and H and L are obtained by measurement of a field laser range finder or measurement of an indoor large-scale topographic map;
an included angle alpha between the lowest point of the front edge of the landslide and the highest point of the top of the landslide1The calculation method comprises the following steps:
α1＝atan(H1/L1)
in the formula, H1The height difference between the position of the outlet of the landslide shear and the highest point of the top of the landslide is L1The horizontal distance between the lowest point of the front edge of the landslide and the highest point of the top of the landslide, H1And L1Measured by a field laser range finder or measured from an indoor large-scale topographic map;
the angle of arrival of landslide α2The calculation method comprises the following steps:
α2＝atan(Hmax/Lmax)
in the formula, HmaxIs the height difference between the lowest point at the bottom of the landslide and the highest point at the top of the landslide, LmaxFor maximum distance of movement of the landslide, said Hmax/LmaxCalculated by an empirical formula, wherein the empirical formula is Hmax/Lmax＝10-0.109logV+0.21。
In the above technical solution, the tower exposure level obtained by the exposure grading module 6 includes a high exposure, a medium exposure and a low exposure; the evaluation standard of the high exposure degree is that alpha is more than or equal to alpha1Showing that the iron tower is located on the landslide bodyIn the up, when the landslide is in a deformation stage, the safety of the iron tower can be directly threatened; the evaluation criterion of the degree of exposure is alpha2＞α＞α1The method shows that the iron tower is located in a stacking area after the landslide is unstable, and after the landslide is unstable in a large scale, the iron tower is threatened; the evaluation standard of the low exposure degree is alpha < alpha2It shows that the iron tower is located outside the accumulation area after the landslide is unstable, and the possibility of being directly threatened by the landslide is low, as shown in fig. 5.
In the above technical solution, the risk level of the high-order landslide of the power transmission line obtained by the landslide risk judgment module 7 includes a first level risk, a second level risk, a third level risk, a fourth level risk and a fifth level risk; the first level of danger indicates that the high-order landslide danger of the power transmission line is extremely high, the second level of danger indicates that the high-order landslide danger of the power transmission line is high, the third level of danger indicates that the high-order landslide danger of the power transmission line is medium, the fourth level of danger indicates that the high-order landslide danger of the power transmission line is low, and the fifth level of danger indicates that the high-order landslide danger of the power transmission line is extremely low.
The judgment standard of the risk level of the high-order landslide of the power transmission line is as follows: when the landslide stability level is poor landslide stability and the iron tower exposure level is high exposure, the landslide risk level is a first level of risk; when the landslide stability level is poor landslide stability and the iron tower exposure level is medium exposure, the landslide risk level is a second level of risk; when the landslide stability level is poor landslide stability and the iron tower exposure level is low exposure, the landslide risk level is a third level risk; when the landslide stability level is poor in landslide stability and the iron tower exposure level is high exposure, the landslide risk level is a second level of risk; when the landslide stability level is poor landslide stability and the iron tower exposure level is medium exposure, the landslide risk level is third level risk; when the landslide stability level is poor in landslide stability and the iron tower exposure level is low exposure, the landslide risk level is a fourth level risk; when the landslide stability level is good in landslide stability and the iron tower exposure level is high exposure, the landslide risk level is a third level risk; when the landslide stability level is good in landslide stability and the iron tower exposure level is medium exposure, the landslide risk level is a fourth level risk; when the landslide stability level is good landslide stability and the iron tower exposure level is low exposure, the landslide hazard level is a fifth level of hazard, as shown in fig. 4.
An improved method for evaluating risk of high-order landslide of a power transmission line, as shown in fig. 2, comprises the following steps:
and 7, integrating the landslide stability grade obtained in the step 5 and the iron tower exposure grade obtained in the step 6 to obtain a high-order landslide risk judgment standard of the power transmission line, so as to obtain the high-order landslide risk grade of the power transmission line.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art. As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting the protection scope thereof, and although the present invention has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that after reading the present invention, they can make various changes, modifications or equivalents to the specific embodiments of the present invention, but these changes, modifications or equivalents are within the protection scope of the appended claims.
Claims (10)
1. An improved evaluation system for risk of high-order landslide of a power transmission line is characterized in that: the evaluation factor establishing module (1) is used for establishing evaluation factors of the stability of the high-order landslide of the power transmission line in the mountainous area, wherein the evaluation factors comprise four types of first-order evaluation factors, and the first-order evaluation factors are represented by second-order evaluation factors; the evaluation factor scoring module (2) is used for grading and scoring the secondary evaluation factors to obtain a quantitative value of the evaluation index of the secondary evaluation factors; the evaluation factor weight determining module (3) is used for determining the weight of the secondary evaluation factor to obtain the weight of the secondary evaluation factor; the evaluation standard quantification module (4) is used for carrying out combined operation on the second-level evaluation factor evaluation index quantification value and the second-level evaluation factor weight to obtain a landslide stability evaluation index; the evaluation index grading module (5) is used for grading the landslide stability evaluation index to obtain a landslide stability grade; the exposure grading module (6) is used for grading the exposure of the iron tower to obtain the exposure grade of the iron tower; and the landslide hazard judgment module (7) is used for obtaining a judgment standard of the high-order landslide hazard of the power transmission line according to the landslide stability grade and the iron tower exposure grade, and obtaining the high-order landslide hazard grade of the power transmission line.
2. The improved power transmission line high-order landslide risk evaluation system based on claim 1 is characterized in that:
the method for establishing the stability evaluation factor of the high-order landslide of the power transmission line in the mountainous area by the evaluation factor establishing module (1) comprises the following steps: firstly, determining a primary evaluation factor and an undetermined secondary evaluation factor representing the primary evaluation factor according to the characteristics of the high landslide of the power transmission line in the mountainous area; secondly, selecting a secondary evaluation factor according to the data acquirability of the undetermined secondary evaluation factor;
the primary evaluation factors in the evaluation factor establishing module (1) comprise instability evidence, slope forms, structural features and human engineering activities; the secondary evaluation factor comprises at least one of the following: surface fractures; a rate of deformation; a slope; the slope height; a structural surface slope body; a slope body structure; excavating; a prevention measure;
the relationship between the first-level evaluation factor and the second-level evaluation factor is as follows: the ground surface cracks and deformation speed in the secondary evaluation factors represent instability evidences in the primary evaluation factors, the slopes and the slope heights in the secondary evaluation factors represent slope forms in the primary evaluation factors, the structural surface slope bodies and the slope body structures in the secondary evaluation factors represent structural characteristics in the primary evaluation factors, and excavation activities and prevention measures in the secondary evaluation factors represent human engineering activities in the primary evaluation factors.
3. The improved power transmission line high-order landslide risk evaluation system based on claim 1 is characterized in that:
the specific implementation mode of grading and scoring in the evaluation factor scoring module (2) is as follows: according to the geological expert experience, the secondary evaluation factors are divided into a grade 1, a grade 2, a grade 3 and a grade 3, the score of the grade 1 is 10, the score of the grade 2 is 7, the score of the grade 3 is 4, and the score of the grade 4 is 1.
4. The improved power transmission line high-order landslide risk evaluation system based on claim 1 is characterized in that:
the specific implementation steps of the evaluation factor weight determining module (3) for obtaining the secondary evaluation factor weight comprise the steps of constructing a hierarchical structure chart, constructing a judgment matrix and calculating the evaluation factor weight;
the hierarchical structure diagram comprises a decision target layer, a criterion element layer and an alternative scheme layer, wherein the decision target of the decision target layer is landslide stability, and the criterion element in the criterion element layer comprises at least one of the following components: surface fractures; a rate of deformation; a slope; the slope height; a structural surface slope body; a slope body structure; excavating; a control measure, alternatives in the alternative layer including stable and unstable;
the specific implementation method for constructing the judgment matrix comprises the following steps: alphabetically representing the secondary evaluation factor as x1,x2...,xnAnd if n is the number of the secondary evaluation factors, the expression of the judgment matrix is as follows:
x1 x2 ... xn
x1 x11 x12 ... x1n
x2 x21 x22 ... x2n
... ... ... ... ...
xn xn1 xn2 ... xnn
in the judgment matrix, selecting the second-level evaluation factor of the first column of the matrix as the evaluation factor to be compared, selecting the second-level evaluation factor of the first row of the matrix as the reference evaluation factor, and x11Represents the evaluation factor x to be compared1And a reference evaluation factor x1Is compared to the score, x12Represents the evaluation factor x to be compared1And a reference evaluation factor x2Is compared to the score, x1nRepresents the evaluation factor x to be compared1And a reference evaluation factor xnIs compared to the score, x21Represents the evaluation factor x to be compared2And a reference evaluation factor x1Is compared to the score, x22Represents the evaluation factor x to be compared2And a reference evaluation factor x2Is compared to the score, x2nRepresents the evaluation factor x to be compared2And a reference evaluation factor xnIs compared to the score, xn1Represents the evaluation factor x to be comparednAnd a reference evaluation factor x1Is compared to the score, xn2Represents the evaluation factor x to be comparednAnd a reference evaluation factor x2Ratio of importanceComparing the values, xnnRepresents the evaluation factor x to be comparednAnd a reference evaluation factor xnAn importance comparison score of; the score range of the importance comparison score is 1-9 scores;
the scoring method for the comparison condition comprises the following steps: and the evaluation factor weight calculation is to introduce the judgment matrix into the analytic hierarchy process professional software and calculate the weight of the evaluation factor.
5. The improved power transmission line high-order landslide risk evaluation system based on claim 1 is characterized in that:
the combined operation formula of the landslide stability evaluation index S in the evaluation standard quantification module (4) is as follows:
S＝V1W1+V2W2+V3W3+V4W4+V5W5+V6W6+V7W7+V8W8
in the formula: s is a landslide stability index, and the larger the value is, the more unstable the tower footing is; v1The quantitative value of an evaluation index of the slope crack, V2For evaluating the quantitative value of the index, V, of the deformation rate3For the grade evaluation index quantification, V4Evaluation of the quantitative value of the index, V, for the slope height5For the evaluation of the index quantification, V, of the structural plane6For evaluating the quantitative value of the index, V, of the slope structure7Evaluation of quantitative values of indexes for excavation activities, V8Evaluating the index quantization value for the prevention measure; w1Evaluation of the index weight value for slope cracks, W2For the deformation rate evaluation index weight value, W3For gradient evaluation of the weight value of the index, W4The weight value of the slope height evaluation index, W5For structural surface evaluation of the weight index, W6Evaluating the weight value of the index for the slope structure, W7For evaluating the weight value of the index for excavation activities, W8And evaluating the index weight value for the prevention and treatment measures.
6. The improved power transmission line high-order landslide risk evaluation system based on claim 1 is characterized in that:
the landslide stability grade obtained by the evaluation index grading module (5) comprises poor landslide stability, poor landslide stability and good landslide stability, and the landslide stability evaluation index S corresponding to the poor landslide stability is more than or equal to 5.6 and less than or equal to 10; the landslide stability evaluation index S corresponding to poor landslide stability is more than or equal to 3.1 and less than 5.6; and the landslide stability evaluation index S corresponding to good landslide stability is more than or equal to 0 and less than 3.1.
7. The improved power transmission line high-order landslide risk evaluation system based on claim 1 is characterized in that:
the exposure grading module (6) obtains an evaluation index of the exposure of the iron tower as an included angle alpha between the iron tower and the highest point of the top of the landslide, and obtains a grading index of the exposure of the iron tower as an included angle alpha between the lowest point of the front edge of the landslide and the highest point of the top of the landslide1And angle of arrival of landslide α2；
The included angle alpha between the iron tower and the highest point of the top of the landslide is atan (H/L)
In the formula, H is the height difference between an iron tower and the highest point of the top of the landslide, L is the horizontal distance between the iron tower and the highest point of the top of the landslide, and H and L are obtained by measurement of a field laser range finder or measurement of an indoor large-scale topographic map;
an included angle alpha between the lowest point of the front edge of the landslide and the highest point of the top of the landslide1The calculation method comprises the following steps:
α1＝atan(H1/L1)
in the formula, H1The height difference between the position of the outlet of the landslide shear and the highest point of the top of the landslide is L1The horizontal distance between the lowest point of the front edge of the landslide and the highest point of the top of the landslide, H1And L1Measured by a field laser range finder or measured from an indoor large-scale topographic map;
the angle of arrival of landslide α2The calculation method comprises the following steps:
α2＝atan(Hmax/Lmax)
in the formula, HmaxIs the lowest point at the bottom of the landslide and the highest point at the top of the landslideHeight difference of high points, LmaxFor maximum distance of movement of the landslide, said Hmax/LmaxCalculated by an empirical formula, wherein the empirical formula is Hmax/Lmax＝10-0.109logV+0.21。
8. The improved power transmission line high-order landslide risk evaluation system based on claim 1 is characterized in that:
the tower exposure level obtained by the exposure grading module (6) comprises a high exposure, a medium exposure and a low exposure; the evaluation standard of the high exposure degree is that alpha is more than or equal to alpha1The method shows that the iron tower is positioned on the landslide body, and the safety of the iron tower can be directly threatened when the landslide is in a deformation stage; the evaluation criterion of the degree of exposure is alpha2＞α＞α1The method shows that the iron tower is located in a stacking area after the landslide is unstable, and after the landslide is unstable in a large scale, the iron tower is threatened; the evaluation standard of the low exposure degree is alpha < alpha2The method shows that the iron tower is located outside the accumulation area after the landslide is unstable, and the possibility of being directly threatened by the landslide is low.
9. The improved power transmission line high-order landslide risk evaluation system based on claim 1 is characterized in that:
the high-order landslide risk level of the power transmission line obtained by the landslide risk judgment module (7) comprises a first level risk, a second level risk, a third level risk, a fourth level risk and a fifth level risk;
the judgment standard of the risk level of the high-order landslide of the power transmission line is as follows: when the landslide stability level is poor landslide stability and the iron tower exposure level is high exposure, the landslide risk level is a first level of risk; when the landslide stability level is poor landslide stability and the iron tower exposure level is medium exposure, the landslide risk level is a second level of risk; when the landslide stability level is poor landslide stability and the iron tower exposure level is low exposure, the landslide risk level is a third level risk; when the landslide stability level is poor in landslide stability and the iron tower exposure level is high exposure, the landslide risk level is a second level of risk; when the landslide stability level is poor landslide stability and the iron tower exposure level is medium exposure, the landslide risk level is third level risk; when the landslide stability level is poor in landslide stability and the iron tower exposure level is low exposure, the landslide risk level is a fourth level risk; when the landslide stability level is good in landslide stability and the iron tower exposure level is high exposure, the landslide risk level is a third level risk; when the landslide stability level is good in landslide stability and the iron tower exposure level is medium exposure, the landslide risk level is a fourth level risk; and when the landslide stability grade is good landslide stability and the iron tower exposure grade is low exposure, the landslide risk grade is a fifth grade risk.
10. A method for evaluating the risk of high-order landslide of a power transmission line by using the system of claim 1 is characterized by comprising the following steps: it comprises the following steps:
step 1, establishing stability evaluation factors of the high-order landslide of the power transmission line in the mountainous area aiming at the characteristics of the high-order landslide of the power transmission line in the mountainous area, wherein the evaluation factors comprise a primary evaluation factor and a secondary evaluation factor;
step 2, grading and scoring the secondary evaluation factors established in the step 1 to obtain an evaluation index quantitative value;
step 3, determining the weight of the secondary evaluation factor established in the step 1 to obtain the weight of the evaluation factor;
step 4, combining the evaluation index quantitative value obtained in the step 2 and the evaluation factor weight obtained in the step 3 to obtain a landslide stability evaluation index;
step 5, grading the landslide stability evaluation index established in the step 4 by adopting a three-level evaluation standard to obtain a landslide stability grade;
step 6, grading the exposure of the iron tower to obtain the level of the exposure of the iron tower;
and 7, integrating the landslide stability grade obtained in the step 5 and the iron tower exposure grade obtained in the step 6 to obtain a high-order landslide risk judgment standard of the power transmission line and obtain a high-order landslide risk grade of the power transmission line.
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